So 900b total among its 36000 employees for a total of 900b/4.3 trillion market cap. Or roughly 20% employee owned (if that 25m number is correct).

This article (warning: obnoxious ads) is the only one I can find that claims to know who nvidea’s shareholders are and puts the number at 4.3%

https://capital.com/en-int/analysis/nvidia-shareholder-who-o...

I would not consider that to be employee owned (although I certainly wouldn’t mind the 25m)